M3(Magic Three or Magnificent Three) is a group of prestigious American EducationConsulting Firms in Shanghai, which represent the highest level of theprofessional American Education Consulting as well as the American admissionresearch in this sector. These following three firms have been constantlydominating various ranking league tables of American Education and AdmissionsConsulting Institutes in Shanghai:

CIIC 中智留学

MEIQIN美勤留学

CEDCA 学美留学

上海有哪些比较过硬的留学中介？比较好，收费合理？

首先建议你先去教育部的监管网站查一下上海那些中介是有资质的正规中介，网站地址粘贴给你 

之后再从中间选在你觉得可以信任的中介办理上海留学中介排名。都可以先去咨询一下，比较一下各个中介的项目和费用等等吧。